Just got the latest from @JordansPearl, who spoke to Rose Tours this morning.
The inventory of rooms from bad credit cards and double bookings is now gone. They are done going through everything. All the wait listers now are relying on cancellations to get rooms. That explains why the calls have dropped off.
Pearl also asked what happens if a single person cancels but the next on the wait list is a group of two people. Rose Tours said that if only a single is available, they will offer it to the duo first before offering it to the next person. The duo then has the option of splitting up or waiting for a double to open.
This puts a different light on the vacancies posted on ning. I'm guessing some will not appreciate the handpicking of offers to fill spots instead of letting Rose Tours fill the vacancies in order of the wait list. Just a guess.
Thanks @JordansPearl for the info!